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Windows 7: BSOD, dxgmms1.sys & cdd.dll crashes while under heavy load

I've had problems with BSODs and random reboots for MONTHS now and after spending over 100EUR and leaving it at the shop for almost 2 weeks it STILL has problems. I don't know if it's a RAM problem - I ran memtest for 4 passes with no errors - or if it's PSU that's defective but the lads at the shop said it was a temperature problem because my PC was dusty... yeah I don't think so at this point seeing as the problems are just the same as before.

I'll attach a txt file with 4 BSOD dumps exported from Blue Screen Viewer. If any other info is needed then just ask.

I suggest you focus for now on the GPU, reinstall the current drivers and install a few older drivers if the reinstallation doesn't help.
I'd also suggest to stress test the GPU, ensure it isn't overclocked, proper seated and adequate cooled.

Thanks for the reply and assistance, I've done as you've said with Furmark and the drivers. I don't know if it's pertinent but I have actually done the clean install, in the way you instructed, several times before per the suggestion of Nvidia customer support and the problems have persisted over several months despite clean drivers, old and new.

If you wanted the Furmark temp log then you're gonna have to tell me where I can find it because I have no idea.

I prefer to know if Furmark did find any errors and what the max temperature was
I've seen only once Furmark giving an error indicating that the GPU was faulty, but in most occasions it is the temperature that causes the problem.

Regarding the seating, I'm veeeeeery scared of touching anything inside my PC, i've never built one myself before and I use it very frequently throughout the day on a daily basis so I want to avoid any prolonged period without it. If I were to reseat the GPU or anything like that then it would be my LAST resort. If you think that reseating is the best troubleshoot then I'll give it some thought but if you think there are other equally valid methods then just let me know what they are and I'll let you know if i've tried them.

BSOD, dxgmms1.sys & cdd.dll crashes while under heavy load

Computer Crashes when under heavy loadHi, my computer continues to crashes when being used heavily.
A little more info from the user. He gets a black not blue screen, the fan speeds up, then 1 long beep and the pc shuts down.
See attached,
Thanks

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BSoD during heavy system loadIs Windows 7 . . .
- x86 (32-bit) or x64 ?
x64
- the original installed OS on the system?
Win 7
- an OEM or full retail version? OEM
- What is the age of system (hardware)?
2 months old (parts bought separately)
- What is the age of OS installation (have you re-installed the OS?)